The software & computer services sector is among today's heaviest fallers on a bad day for shares generally.Among the fallers is Bango. Losses grew at mobile payments group during the six months ended 30 September, up to £460,000 from £240,000 a year agoRevenue fell to £10.61m from £12.32m following a drop in low margin end user revenues to £9.80m from £11.59m, partly blamed on operator refund policies in the US that affected two of Bango's largest customers.Top performing sectors so far todayGeneral Retailers 1,693.86 +0.02%Bottom performing sectors so far todayForestry & Paper 5,108.86 -2.81%Industrial Metals & Mining 7,306.72 -2.58%Household Goods & Home Construction 6,328.69 -1.99%Food Producers & Processors 4,887.12 -1.94%Software & Computer Services 647.48 -1.78%